One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,6,8,7)(9,10)(11,15)(12,14)(13,16)(17,18)(19,27)(20,23)(21,26)(22,25)(24,30)(28,31)(29,32)(9,11,12,16)(10,13,14,15)(18,23)(19,28)(21,22)(24,27)(29,30)(31,32)(2,4)(5,7,8,6)(17,19)(18,24)(20,29)(21,28)(22,30)(23,31)(25,32)(26,27)(10,14)(13,15)(18,23)(19,29)(25,26)(28,30) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.